Oral b pro expert pro flex manual toothbrush has individual pro flex sides with crisscross bristles that adapt to the shape of the mouth to effectively remove plaque for a superior level of clean while remaining gentle on teeth and gums 2 flexing sides one superior clean with regular use vs an ordinary manual brush oral b pro expert pro flex manual toothbrush removes up to 93 of plaque in hard to reach areas better cleaning at the gumline vs an ordinary manual toothbrush